Pyridine is a six-membered heterocyclic compound containing one nitrogen heteroatom. Pyridine and piperidine are the most frequently occurring heterocyclic building blocks in drug molecules. According to incomplete statistics, there are currently more than 180 drugs containing pyridine or piperidine structure that have been marketed, nearly 1/5 of the drugs approved for marketing in recent years contain these two structures.
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Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom. It is a highly flammable, weakly alkaline, water-miscible liquid with a distinctive, unpleasant fish-like smell.
Thiazine is an organic compound containing four carbon rings, one nitrogen atom and one sulfur atom. Thiazine has three isomers, 1,2-thiazine, 1,3-thiazine and 1,4-thiazine, which are arranged differently in the ring. Nitrogen-containing heterocyclic compounds such as 1,4-thiazine and its benzo derivatives are important compounds in many different research fields due to their remarkable biological properties.
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